20566016121 has 8 divisors (see below), whose sum is σ = 31338691264. Its totient is φ = 11752009200.

The previous prime is 20566016111. The next prime is 20566016131. The reversal of 20566016121 is 12161066502.

It is an interprime number because it is at equal distance from previous prime (20566016111) and next prime (20566016131).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20566016121 - 2⁹ = 20566015609 is a prime.

It is a super-2 number, since 2×20566016121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20566016111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489667030 + ... + 489667071.

It is an arithmetic number, because the mean of its divisors is an integer number (3917336408).

Almost surely, 2^20566016121 is an apocalyptic number.

20566016121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20566016121 is a deficient number, since it is larger than the sum of its proper divisors (10772675143).

20566016121 is an equidigital number, since it uses as much as digits as its factorization.

20566016121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979334111.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 20566016121 in words is "twenty billion, five hundred sixty-six million, sixteen thousand, one hundred twenty-one".